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EIS and XPS Investigation on SEI Layer Formation during First Discharge on Graphite Electrode with a Vinylene Carbonate Doped Imidazolium Based Ionic Liquid Electrolyte

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dc.contributor.author Morales-Ugarte J.E. es_PE
dc.contributor.author Bolimowska E. es_PE
dc.contributor.author Rouault H. es_PE
dc.contributor.author Santos-Peña J. es_PE
dc.contributor.author Santini C.C. es_PE
dc.contributor.author Benayad A. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2018
dc.description J.E.M.-U. received funding for his scholarship from FONDECYT-CONCYTEC (Grant 232-2015-FONDECYT).
dc.description.abstract Adding organic carbonates (e.g., vinylene carbonates, VC) into ionic liquid based electrolyte generally improves the electrochemical performances of graphite electrode (Cgr) in lithium ion batteries. In this study, step-by-step electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) were performed during the first reduction cycle to follow the formation of the solid electrolyte interphase (SEI) in lithium/graphite (Li/Cgr) cell using (1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) [C1C6Im][NTf2] doped with vinylene carbonate (VC). The EIS spectra evolution, recorded at different cutoff voltages, indicated a two-step SEI thin film formation. These results were supported by XPS measurement at the same cutoff voltage. Hence, we pointed out that the first film results from the VC decomposition at 0.8 V to form an organic layer constituted of lithium alkylcarbonates. This film was developed up to 0.2 V. From 0.8 to 0.2 V, we detected a slight decomposition of IL solvent. This process was driven by a progressive sulfone decomposition reaction through the formation of polyoxysulfone, Li2S, Li3N, and LiF. This process was at the origin of the formation of the second film of inorganic nature beyond 0.2 V. This SEI film was stable up to 0.01 V; the composition probed by XPS remained unchanged.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1021/acs.jpcc.8b03636
dc.identifier.scopus 2-s2.0-85050737634
dc.identifier.uri https://hdl.handle.net/20.500.12390/588
dc.language.iso eng
dc.publisher American Chemical Society
dc.relation.ispartof Journal of Physical Chemistry C
dc.rights info:eu-repo/semantics/openAccess
dc.subject X ray photoelectron spectroscopy
dc.subject Carbonates es_PE
dc.subject Electric discharges es_PE
dc.subject Electrochemical electrodes es_PE
dc.subject Electrochemical impedance spectroscopy es_PE
dc.subject Fluorine compounds es_PE
dc.subject Graphite es_PE
dc.subject Graphite electrodes es_PE
dc.subject Ionic liquids es_PE
dc.subject Seebeck effect es_PE
dc.subject Solid electrolytes es_PE
dc.subject Thin films es_PE
dc.subject Decomposition reaction es_PE
dc.subject Electrochemical performance es_PE
dc.subject Imidazolium-based ionic liquid es_PE
dc.subject Ionic-liquid based electrolytes es_PE
dc.subject Organic carbonates es_PE
dc.subject Solid electrolyte interphase es_PE
dc.subject Thin film formation es_PE
dc.subject Vinylene carbonates es_PE
dc.subject Lithium compounds es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.04.00
dc.title EIS and XPS Investigation on SEI Layer Formation during First Discharge on Graphite Electrode with a Vinylene Carbonate Doped Imidazolium Based Ionic Liquid Electrolyte
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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